Downstream low fluid pressure emergency shutoff valve
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United States of America Patent
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-
Dec 20, 1994
Issued Date -
N/A
app pub date -
Feb 14, 1994
filing date -
Jul 30, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An emergency shutoff valve for monitoring fluid and stopping fluid flow in a conductor in the event of fluid pressure decrease below a predetermined value at the downstream outlet port of a valve. The valve body contains a valve seat and a normally open valve for seating on the seat and includes opposing valve stems each slidably supported, at one end portion, by the body. The valve head is fluid pressure balanced by equal upstream and downstream valve stem cross sectional areas. A plate is secured to the body by posts in axial spaced relation with respect to the downstream outwardly projecting end portion of one valve stem for supporting a pressure collapsible rod-like pin axially interposed between the plate and the valve stem. A valve stem spring biases the valve toward its seat with the bias offset by fluid pressure against a valve stem piston on the upstream end of the valve stem. A drop in pressure against the valve stem piston assists the spring in collapsing the pin and seating the valve.
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